Create Post/Tag/Remove module class and route

- Fix tag name parameter in single tag removal link in mod/photos
- Remove "/post" from backend routes as it was preventing sessions from working in this module. No existing module had a route starting with "/post".

view/templates/post/tag/remove.tpl

@@ -0,0 +1,19 @@
+<div class="generic-page-wrapper">
+	<h3>{{$l10n.header}}</h3>
+
+	<p id="tag-remove-desc">{{$l10n.desc}}</p>
+
+	<form id="tagrm" action="post/{{$item_id}}/tag/remove?return={{$return}}" method="post">
+		<ul>
+{{foreach $tag_checkboxes as $tag_checkbox}}
+			<li>
+                {{include file="field_checkbox.tpl" field=$tag_checkbox}}
+			</li>
+{{/foreach}}
+		</ul>
+		<p>
+			<button type="submit" id="tagrm-submit" class="btn btn-primary" name="submit">{{$l10n.remove}}</button>
+			<button type="submit" id="tagrm-submit" class="btn" name="cancel">{{$l10n.cancel}}</button>
+		</p>
+	</form>
+</div>